Description: Upstream filtering is a method of mitigating DDoS (Distributed Denial of Service) attacks that focuses on evaluating and filtering network traffic before it reaches its final destination. This approach allows for the identification and blocking of malicious requests at the early stages of traffic, helping to protect servers and applications from overloads that can result in service interruptions. Through advanced traffic analysis techniques, upstream filtering can distinguish between legitimate and potentially harmful traffic, allowing only valid requests to reach the target server. This process not only improves service availability but also optimizes resource usage by preventing the server from being overwhelmed by excessive unwanted traffic. The implementation of this type of filtering is crucial in a digital environment where DDoS attacks are becoming increasingly common and sophisticated, and it has become an integral part of the cybersecurity strategies of organizations across various sectors.